Levocetirizine is an antihistamine which is used to get relief from allergy symptoms such as watery eyes, runnynose, itching eyes/nose, and sneezing. It is also used to relieve itching andhives. It works for blocking a certainnatural substance (histamine) that your body makes during an allergic reaction. Montelukast is used regularly to prevent you from the wheezing and shortness of breathcaused by asthmaanddecrease the number of asthma attacks.Montelukast is also used before exercise toprotect body from breathing problems during exercise.